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Answered on 13/05/2020 CBSE/Class 12/Science/Biology/Unit 1- Reproduction/Reproduction in Organisms

Abhishek Chauhan

A teacher who redefines the way you understand concepts.

If organisms don't reproduce, new organisms will not be produced and because old organisms have to die (that's just how biology works, living cells. Thus the whole organism don't live forever), the entire species will disappear in one life-time of that organism. Think it this way, along with the 4 billion... read more

If organisms don't reproduce, new organisms will not be produced and because old organisms have to die (that's just how biology works, living cells. Thus the whole organism don't live forever), the entire species will disappear in one life-time of that organism.

Think it this way, along with the 4 billion years history of life evolution on earth there were many species which could not reproduce adequately. Because of that all of those species got eliminated. And that's why in today's world all organisms reproduce (effectively) because these are the survivor species, ancestors of today's organisms were the only one who figured out effective reproduction through the process of evolution. 

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Answered on 12/05/2020 CBSE/Class 12/Science/Biology/Unit 1- Reproduction/Reproduction in Organisms

Anita D.

Education is only a tool with of that u can gain every thing

Sexual reproduction is a better mode of reproduction. Because it allows the formation of new variants by the combination of the DNA from two different individuals, typically one of each as gender. On the contrary, asexual reproduction allows very little or no variation at all.
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Answered on 12/05/2020 CBSE/Class 12/Science/Biology/Unit 1- Reproduction/Reproduction in Organisms

Anita D.

Education is only a tool with of that u can gain every thing

The offspring formed by asexual reproduction referred to as clone because the offspring morphologically and genetically similar to each other and parent. In asexual reproduction, the office principle used a morphological as well as genetically identical and exact copies of their parents.
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Answered on 12/05/2020 CBSE/Class 12/Science/Biology/Unit 1- Reproduction/Reproduction in Organisms

Anita D.

Education is only a tool with of that u can gain every thing

Offspring formed fusion of two gametes, and resultant zygote formation has a better chance of survival, this is because during fusion of two gametes, the gamets of two parents, male, and female, come together and fuse. Thus, the offspring has the genetic material of both the parents.
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Answered on 12/05/2020 CBSE/Class 12/Science/Biology/Unit 1- Reproduction/Reproduction in Organisms

Anita D.

Education is only a tool with of that u can gain every thing

In asexual reproduction, offsprings are produced by a single parent without the involvement of gamete formation and fusion. Thus offsprings resemble the parent genetically and morphologically. In reproduction, the fusion of two gametes occurs, and fertilization and meiosis are essential events.
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Answered on 18/06/2020 CBSE/Class 12/Science/Biology/Unit 1- Reproduction/Reproduction in Organisms

Deepika Agrawal

Interested to teach to class 1 to 5 , 6 to 10 , 11&12

In plants, the units of vegetative propagation such as runner, rhizome, sucker, tuber, offset, bulb are all capable of giving rise to new offsprings. Examples of vegetative propagation: (i) Vegetative propagation by leaves, in Bryophyllum (ii) Vegetative propagation by the stem (rhizome) in Ginger, Turmeric... read more

In plants, the units of vegetative propagation such as runner, rhizome, sucker, tuber, offset, bulb are all capable of giving rise to new offsprings.

Examples of vegetative propagation:

(i) Vegetative propagation by leaves, in Bryophyllum

(ii) Vegetative propagation by the stem (rhizome) in Ginger, Turmeric etc.

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Answered on 13/05/2020 CBSE/Class 12/Science/Biology/Unit 1- Reproduction/Reproduction in Organisms

Narendrakumar Vishwakarma

Physics and Mathematics Expert with more than 5 Years of Experience

Gametogenesis is a process of producing gametes. And while producing haploid gametes, the cell has to go through the media. Therefore we can say that meiosis and gametogenesis are always interlinked.
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Answered on 13/05/2020 CBSE/Class 12/Science/Biology/Unit 1- Reproduction/Reproduction in Organisms

Define (a) Juvenile phase, (b) Reproductive phase, (c) Senescent phase. read more

Define

(a) Juvenile phase,

(b) Reproductive phase,

(c) Senescent phase. read less

Anita D.

Education is only a tool with of that u can gain every thing

(a) Juvenile phase:- It is the period of growth in an individual organism after its birth and before it reaches reproductive maturity (b) Reproductive stage:- It is the period when a single organism reproduces sexually (c) Senescent stage:- It is the period when an organism grows old and loses the ability... read more

(a) Juvenile phase:- It is the period of growth in an individual organism after its birth and before it reaches reproductive maturity

(b) Reproductive stage:- It is the period when a single organism reproduces sexually

(c) Senescent stage:- It is the period when an organism grows old and loses the ability to reproduce.

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Answered on 28/07/2020 CBSE/Class 12/Science/Biology/Unit 1- Reproduction/Reproduction in Organisms

Define external fertilization. Mention its disadvantages.

Shobana S.

Personalized coaching for MATHS, SCIENCE,HINDI subjects.

The type of fertilisation in which male and female gamete takes place outside the body of the female is called external fertilisation. It is commonly observed in aquatic animals like starfish, frog and fish. Disadvantages are most of the male and female gametes will go wasted, i.e. it will remain unfertilised.... read more

The type of fertilisation in which male and female gamete takes place outside the body of the female is called external fertilisation. It is commonly observed in aquatic animals like starfish, frog and fish. Disadvantages are most of the male and female gametes will go wasted, i.e. it will remain unfertilised. External surroundings may cause harm to the gametes, which is present outside.

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Answered on 28/07/2020 CBSE/Class 12/Science/Biology/Unit 1- Reproduction/Reproduction in Organisms

Why are offspring of oviparous animals at a greater risk as compared to offspring of viviparous animals? read more
Why are offspring of oviparous animals at a greater risk as compared to offspring of viviparous animals?

 
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Shobana S.

Personalized coaching for MATHS, SCIENCE,HINDI subjects.

The animals which give birth to the young ones are called viviparous animals. The animals which lay eggs are called oviparous animals. The eggs of few animals are easy to observe since they lay outside their bodies. So there is a higher risk of the eggs being eaten by their enemies, or it may fall from... read more

The animals which give birth to the young ones are called viviparous animals. The animals which lay eggs are called oviparous animals. The eggs of few animals are easy to observe since they lay outside their bodies. So there is a higher risk of the eggs being eaten by their enemies, or it may fall from their nest. Thus, offspring of oviparous animals are at a higher risk as compared to the offspring of viviparous animals.

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